A new note from JPMorgan economist Jesse Edgerton looks at what is happening with Americans who are working part-time for “economic reasons” — or Americans involuntarily working part time. As you can see in the above chart — the red line — the numbers remains elevated despite big declines in the U-3 and U-6 jobless rates. Edgerton:

There has been little recent relationship between the number of “extra” part-time workers and the level of U3 unemployment, questioning the idea that driving U3 down further will reduce involuntary part-time employment. . . In a note last year, we pointed out that the shift strikingly coincided with the passage of the ACA, which included an employer mandate to provide health insurance to employees working 30 or more hours per week. . . passage of the ACA preceded a large and unprecedented shift from workers working more than 30 hours per week to just under 30 hours. We continue to believe that the ACA can explain a significant number of the “extra” involuntary part-time workers.